J.-B. Bru, V. A. Zagrebnov
Exactly soluble model with two kinds of Bose-Einstein condensations
(110K, LATeX 2e)

ABSTRACT.  We present a simple exactly soluble model which manifests two kinds
of Bose-Einstein condensations, a non-conventional one due to a diagonal
perturbation of the perfect Bose-gas and a conventional one corresponding to
the standard mechanism of saturation.